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<p>Welded structure’s stress corrosion cracking (SCC) is the primary environmental damage phenomenon in water reactors, and the crack-tip strain rate is the most important mechanical parameter, but quantitative evaluation is very difficult. This paper establishes a numerical model of SCC crack-tip creep using compact tension specimens, analyzing various macrostructural parameters, including the effects of mechanical parameters influencing material plasticity and the variation in crack-tip stress intensity factors on crack-tip creep behavior. The functional relationship between macrostructural parameters and the crack-tip creep rate has been established, and a quantitative calculation method based on crack-tip creep has been developed, laying the foundation for the predictive capability of the SCC model.</p>

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Quantitative Calculation Method of Crack Tip Strain Rate Based on Crack-Tip Creep

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Y. H. Cui,
  • J. L. Zhang

摘要

Welded structure’s stress corrosion cracking (SCC) is the primary environmental damage phenomenon in water reactors, and the crack-tip strain rate is the most important mechanical parameter, but quantitative evaluation is very difficult. This paper establishes a numerical model of SCC crack-tip creep using compact tension specimens, analyzing various macrostructural parameters, including the effects of mechanical parameters influencing material plasticity and the variation in crack-tip stress intensity factors on crack-tip creep behavior. The functional relationship between macrostructural parameters and the crack-tip creep rate has been established, and a quantitative calculation method based on crack-tip creep has been developed, laying the foundation for the predictive capability of the SCC model.